This five-volume set LNCS 14684-14688 constitutes the refereed proceedings of the Human Computer Interaction thematic area of the 26 International Conference on Human-Computer Interaction, HCII 2024, held in Washington, DC, USA, during June 29 – July 4, 2024. The total of 1271 papers and 309 posters included in the HCII 2024 proceedings was carefully reviewed and selected from 5108 submissions. The VAMR 2024 proceedings were organized in the following topical sections: Part I: HCI Theory and Design and Evaluation Methods and Tools; Emotions in HCI. Part II: Human-Robot Interaction; Child-Computer Interaction. Part III: HCI for Mental Health and Psychological Wellbeing; HCI in Healthcare. Part IV: HCI, Environment and Sustainability; Design and User Experience Evaluation Case Studies. Part V: Multimodality and Natural User Interfaces; HCI, AI, Creativity, Art and Culture.